The white powder is likely phosphorus. When phosphorus is burned in air, it produces white fumes and eventually turns into phosphorus pentoxide, which appears as a red powder.
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Turmeric powder is commonly used as an indicator. When added to a substance, it turns red in the presence of a base and yellow in the presence of an acid. To test if salt is acidic or basic, mix a small amount of turmeric powder with water and add a pinch of the salt. If the turmeric turns red, the salt is basic; if it turns yellow, the salt is acidic.
The white powder is likely to be a base as it sank to the bottom when mixed with distilled water. The red color observed after adding universal indicator indicates that the solution became acidic. This suggests that the white powder was an insoluble base that released a basic solution when mixed with water, which turned acidic upon adding the indicator.
Red litmus paper remains red when dipped in water. Litmus paper is used to test for acidity or basicity, and red litmus paper turns blue in basic solutions. If the water being tested is neither acidic nor basic, the red litmus paper will not change color.
Lithium turns red in flame tests.
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